I would look into the following Patterns:
BusinessDelegate , SessionFacade
For Database connectivity with EJBs you should also look at
servicelocator.
Typically what I do is:
Have an action:
To retrieve data from a database -- I pass all necessary
interface parameters to a BusinessDeleget. The business delegate does
all of the work to prevent tier leakage.
A BusinessDelegate will pass back a ValueObject (JavaBean) to a
JSP Page.
I'll save that bean in a request or session attribute for use
within the JSP page.
Hope this gives you some insight.
Here is a code snippet:
public ActionForward findOrderDetail(ActionMapping _mapping,
ActionForm _form, HttpServletRequest _request, HttpServletResponse
_response )
{
UserInfo _userInfo = getUserInfo();//private method to get
user info
String _userId = "null user";
ActionErrors _errs = new ActionErrors();
FindOrderDetailActionFormBean _params =
(FindOrderDetailActionFormBean) _form;
try
{
getConsolePrinting(this.getResources(_request));
_errs = checkActionErrors(_mapping, _form, _request);
if(_errs.size()==0)
{
Logger.debug( "[MyOrdersDispatchAction.java][public
ActionForward findOrderDetail(ActionMapping _mapping, ActionForm _form,
HttpServletRequest _request, HttpServletResponse _response)][started
with 0 Errors Found.]");
IOrderManagerPDA _mgr =
OrderManagerBD.getOrderManagerPDA();
Logger.debug ( "[MyOrdersDispatchAction.java][ public
ActionForward findOrderDetail(ActionMapping _mapping, ActionForm _form,
HttpServletRequest _request, HttpServletResponse
_response)][IOrderManager Created And Retrieved. Params Recovered from
FindOrderDetailActionFormBean. User Id is {"+_userId+"} Location is
{"+_params.getLocation()+"} Order Number is {
"+_params.getOrderNumber()+" } ]");
//THIS IS A VALUE OBJECT BEAN THAT YOU SHOULD
CREATE IN
//YOUR BUSINESS DELEGATE AND USE IN YOUR JSP
PAGES
IOrderVOPDA orderVO = _mgr.getOrder(_userId ,
_userInfo.getregionId(), _params.getLocation(),
_userInfo.getisHybridLocation() , _userInfo.getbillingSystem(),
_userInfo.getbillingSystemText() ,
Integer.parseInt(_params.getOrderNumber()) );
if( orderVO != null )
{
_request.setAttribute("orderVO" , orderVO );
Logger.debug( "[MyOrdersDispatchAction.java][private
ActionForward findOrderDetail(ActionMapping _mapping, ActionForm _form,
HttpServletRequest _request, HttpServletResponse _response)][
Initializing Location to Location is {"+_params.getLocation()+"} .
Returning {"+_SUCCESS+"}. User Id is {"+_userId+"} Order Number is {
"+_params.getOrderNumber()+" } ]" );
Logger.debug("[MyOrdersDispatchAction.java][private ActionForward
findOrderDetail(ActionMapping _mapping, ActionForm _form,
HttpServletRequest _request, HttpServletResponse _response)][ Session
Value of orderVO has been initialized. Returning {"+_SUCCESS+"}. User
Id is {"+_userId+"} Location is {"+_params.getLocation()+"} Order
Number is { "+_params.getOrderNumber()+" } ]" );
_request.getSession().setAttribute("sessionLocation"
, _params.getLocation() );
return _mapping.findForward(_SUCCESS);
}
else
{
throw new FindOrderDetailException("Order Not Found.
NOT FAILURE.");
}
}
else
{
throw new FindOrderDetailException("Errors found in
request.");
}
}catch(FindOrderDetailException fod)
{
//Return action errors to the user
}
}
-----Original Message-----
From: Minghui Yu [mailto:[EMAIL PROTECTED]
Sent: Friday, November 16, 2007 4:40 PM
To: Struts Users Mailing List
Subject: Pass Javabeans
Hi folks,
I know it is a stupid question. But how shall I pass JavaBeans from an
Action object to a JSP page? Use setAttribute('xxx',xxx)?
I have a list of JavaBeans that I want to pass to JSP pages to display
one by one.
Shall be a very simple question to anyone who is not a brand new
beginner to struts (version 1) like me :)
Thanks a lot.
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